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1、基于EPON的宽带接入网方案设计基于EPON的宽带接入网方案设计摘要近年来,骨干网的能力进一步增强,与此同时接入网方面却没有大的改进。接入网的能力的增长远远落后于Internet流量的快速增长,因而接入网成为高效的LAN和骨干网发展的瓶颈,又被称为“最后一公里”。EPON由于集中了以太网设备价格低廉和光纤能够提供高带宽的优点,成为下一代接入网的最佳选择。本论文首先从接入网的基本概念出发,对接入网的定义与定界和拓扑结构进行介绍,然后介绍了目前流行的几种宽带接入技术,引出EPON接入技术,并对EPON技术的产生背景、网络结构、工作原
2、理和技术特点作进一步介绍;进而从EPON业务接入出发,分析EPON系统支持的业务类型以及需求,设计了一套支持多业务的接入解决方案;最后从EPON的应用角度,阐述EPON接入网的组网原则,并针对不同类型的用户接入,分别选取了校园网、商业客户和居民用户三类典型用户,采用基于EPON的多种接入技术混合组网模式,为校园网、大客户/集团客户、中小企业用户、城市小区居民用户、农村居民用户设计了五套接入方案。关键词:接入网,EPON,多业务,校园网,商业客户,居民用户信息工程学院信息工程专业(通信工程专业)姚柏祥200207014229基于E
3、PON的宽带接入网方案设计SchematicDesignOfBroadbandAccessNetworkBasedonEPONAbstractInrecentyears,thecapabilityofBackboneNetworkhasbeenmoreincreased,theaccessnetworkhasnotmuchimprovementinthemeantime.TherateofincreaseofcapabilityoftheaccessnetworkisfarbehindtheflowofInternet,soth
4、eaccessnetworkhasbecomethebottleneckofthedevelopmentofthehighefficiencyLANandBackboneNetwork,anditgoesthenameof“thelastonekilometer”.DuetoEPONisatechnologywiththeadvantagesofthelow-priceEthernetequipmentsandfiberwhichcanprovidehighbandwidth,itbecomesthebestchoiceofth
5、enextaccessnetwork.Thearticleproceedfromthebasicconceptofaccessnetwork,introducesthedefinitionanddemarcation/opologicalstructureofaccessnetwork,thenintroducessomeBroadbandaccesstechenologiesthatarepopularnow,todrawtheaccesstechnologyofEPON,andfutherintroducesthebackg
6、roundofgeneration/networkstructure/theoryofoperation/techniquefeatureofEPON;AndproceedfromtheserviceaccessofEPON,analyzetheservicetypesanddemandswhichEPONsystemsupports,designaaccessschemewhichcansupportdifferentservices;finally,fromtheapplicationangleofEPON,expatiat
7、ethemeshingprinciple,andaimatdifferentkindsofusers,separateselectcampusnetwork/commercialclient/denizenusertheserepresentativeuser,baseonEPONandusedifferentaccesstechnologies,separatedesignfiveschemesforcampusnetwork/largeclientorblocclient/mediumandsmall-sizedenterp
8、risesuser/residencyuserincityandruraluser.Keywords:AccessNetwork,EPON,DifferentServices,CampusNetwork,commercialclient,denizenuser信